Interviewer: We usually talk about your directing, but completely out of nowhere, what is the one unexpected moment on set that absolutely destroyed your professionalism and made you break character?

Alan Alda: Oh, absolutely. There is one specific day that stands out above all the rest. It involves the great Harry Morgan, long before he became Colonel Potter.

People forget that Harry first appeared on our show as a completely different character, a mad general named Bartford Steele. He was a hyper-disciplined, totally unhinged military man.

We were shooting on the outdoor set in the Malibu hills. It was a scorching hot afternoon, dust was blowing everywhere, and we were exhausted. We were filming a scene where this general is inspecting the officers outside the tents.

Harry was one of the funniest human beings to ever walk the earth. He had a deadpan delivery that could dismantle your composure in seconds.

During rehearsals, he did the lines perfectly standard. But Harry secretly loved to play games with us. He wanted to see if he could crack us up when the cameras started rolling.

For this take, the director wanted something eccentric to show the general’s madness. The rest of us—myself, Wayne Rogers, and McLean Stevenson—were lined up in the dirt, supposed to be standing at strict, solemn military attention.

I remember whispering to Wayne right before the cameras started rolling, telling him we needed to stay focused so we could wrap up the day. I was absolutely determined to keep a straight face no matter what he did.

The director called action. Harry marched into the frame, completely in character, but with a bizarre, manic intensity that wasn’t there during rehearsal.

And that’s when it happened.

Instead of delivering a stern reprimand, Harry looked me dead in the eye.

His expression was perfectly serious, completely stone-faced.

Then, he suddenly started singing “Mississippi Mud” at the top of his lungs.

As he sang, he began doing a bizarre little tap-dance shuffle right there in the Malibu dirt.

His face was like granite, totally sober, which made the whole spectacle ten times more hysterical than if he had been visibly joking around.

I froze instantly.

My jaw clenched so hard I genuinely thought my teeth might crack from the pressure.

I could see Wayne Rogers out of the corner of my eye, and his shoulders were already starting to heave up and down silently.

McLean Stevenson let out this tiny, muffled snorting sound, desperately trying to choke back his own laughter.

That was the absolute worst thing McLean could have done because it instantly triggered a massive chain reaction across the entire line.

The director yelled cut, laughing out loud himself, and told us to take it from the top.

He told Harry to keep that exact same crazy energy, but he begged the rest of us to please hold it together so we could actually get the shot.

We lined up in the dust for take two.

I told myself I was a professional and could handle this.

I decided that I simply would not look at Harry’s eyes when he approached me.

Instead, I focused entirely on his left earlobe.

The camera started rolling, the director called action, and Harry marched right up to me again.

He immediately noticed that I was actively avoiding eye contact with him.

So, he deliberately leaned directly into my line of sight, bringing his face about three inches away from mine.

He sang even louder this time, adding an incredibly dramatic, theatrical hand gesture right under my nose.

That completely shattered my composure.

I broke character entirely, buried my face in both of my hands, and just started howling with laughter.

Once I let go, the floodgates opened up completely for everyone else.

Wayne was laughing so hard that he practically fell over sideways into the dirt.

McLean was bent double, making these high-pitched wheezing noises like a dying teapot.

The director was laughing right along with us, but he also knew that the sun was starting to go down behind the hills.

He desperately begged us to try just one more time before we lost the light.

Take three turned out to be an absolute, unmitigated disaster.

We didn’t even manage to make it to the actual singing part of the scene.

Harry just walked into the frame, looked at the three of us with this knowing, mischievous twinkle in his eye, and the entire cast broke character simultaneously.

We collapsed into giggles before he could even open his mouth to speak a single word.

At that point, the camera crew had to completely stop filming.

The camera operator was laughing so hard the entire rig was shaking violently, ruining the shot.

We were all standing out there in the blazing heat, tears literally streaming down our dusty faces.

We were completely helpless against this veteran actor who was treating our television set like his own personal playground.

It ultimately took us about seven or eight retakes before we could finally secure a clean version of that sequence.

Every single attempt failed miserably because someone would catch a glimpse of Harry’s deadpan expression and lose their mind all over again.

In the end, the only way we got through it was by having the director rearrange the background crew so we wouldn’t see them cracking up.

I literally had to stare at a specific bronze button on Harry’s uniform shirt and pray for mechanical strength.

That chaotic afternoon became absolutely legendary among the cast and crew for years to follow.

It was the exact day we all fully realized that Harry Morgan was an unstoppable comedic force of nature.

That brilliant performance was a huge reason why every single one of us advocated so strongly to bring him back permanently as Colonel Potter when McLean eventually left the show.

Looking back after all these decades, those are the exact moments that I treasure the most from our time on MAS*H.

We worked incredibly long hours under tough conditions, dealing with heavy, emotional themes, but we always had this beautiful gift of shared, uncontrollable laughter.

It really reminds you that even in the most stressful environments, a little bit of unexpected joy can completely salvage your spirit.

Do you have a favorite memory of Harry Morgan’s brilliant comedy from the show?